Taper gauge



April' 21, 1935.

` A. L. BOSENCE ET AL `TAPER` GAUGE 2 sheets-sheet' 1 Filed July 20,1952 INVENTORS A Yc-ile L 5056716642@ George 5 /Tzgrakawg 5f April 21,1936. A. l.. OSENCE ET Al.

TAER GAUGE Filed July 2o, 1952 2 Sheets-Sheet 2 INVENTORS A YC /1 LeBose-nce m/ Georg 5)/ Patented Apr. 2l, 1936 PATENT OFFICE 2,038,472TAPER GAUGE Archie L. Bosence an d George B. Ingraham,

` WestSt. John, 'New Brunswick, Canada. Application July 20, 1932,Serial No. 623,652

1 Claim.

This invention relates to improvements inthe design and construction ofa taper gauge and more particularly to a taper gauge designed formeasuring the female part of a taper, the primary object being toprovide a type of gauge especially adapted lto measure the amount voftaper in its relationship to a definite linear. length of the slantheight or taper side.

A further object is toprovide a gauge having means for varying thediameter, of thegauge and for maintaining any intermediate adjustmentbetween the major and minor diameters of the gauge. Y

Still further objects are to provide a gauge adapted to accuratelymeasure worn taper lits that would otherwise require the trial and errormethod, such as ships rudder pintles, turbine taper ts and the like, andto provide a gauge having a varying diameter, the centre of which isalways on the longitudinal centre line of gauge, thus maintaining thesides and side scales in equidistant relationship.

With these and other objects in View,` as will appear asthe descriptionproceeds, the invention consists in the design, construction andarrangement of parts as hereinafter more specifically set forth,claimed, and shown in the accompanying drawings forming a part of thispresent application and in which:

, Fig. 1 shows the design and construction of the lower plate member. v

Fig. 1A is an end View of Fig. 1,.

Fig. 2 shows the design and construction of the upper plate member.

Fig. 2A is a view of the adjusting bolt with the parts thereof inseparate relation, Fig. 2B is a view of one of the studs, with the partsthereof in separate relation. f

Fig. 3 shows the gauge assembly.

Fig. 4 is a side view of Fig. 3.

Fig. 5 is anl end view taken on the lines 5-5 of Fig. 3.

Referring more in detail to the accompanying drawings in which similarcharacters represent corresponding parts throughout the several views,it will be seen that the gauge consists of upper and lower symmetricaltriangular plate members I0 and II, respectively. The inner edges of theplates are disposed 30 degrees angularly to the outer edges, the innerapex of the 120 degree angle being formed into the arc as shown at I2.

The lower plate II is provided with the bevel I3 on the under sidethereof while the upper side is divided into the scale A, said scalebeing graduated to register true linear measurement.

The upper plate I0 is provided with the bevel I4 on the upper sidethereof, the bevel face being divided into the scale B, said scale beingidentical to the scale A. Both plates are provided with similarlyoriented studs I 5, the studs on the under plate II being slightlylonger than the studs on the upper plate I0 in order that the stud topson both members may be in a plane paralel to the surface planes of theplates, as shown in Fig. 5. Each stud I5 is provided with the indentedshoulder Ita, Fig. 2B which engages an aperture provided in the platemember, the stud being maintained in position by a threadedset screw I1inserted from the under side of the plate.V 'I'he orientation of thestuds I5 of each plate is such that they are equidistant from the endsofthe plates, and the distance longitudinally between their diametriccentres is inthis instance 12 inches. They are also mounted inwardlyfrom the outer edges a specic distance, preferably one half inch so thata constant of one inch is established as a plussage for the gauge whichmust be added to the lateralv readings taken from the scale D. Y

Both plate members are provided with the transversely adjustable centrecomprising an elongated slot I8, said suitably pitched rack I9, the rackin the upper plate being oppositely disposed to the rack in of the platemember tor the inner end of the rack must be such that the minordiameter of the gauge permits no over projection of the plate members.

For adjusting and maintaining the plates in position a threaded bolt 20and gear 20a together with an adjusting nut 2| and clamping nut 22 areprovided. The gear 20a is constructed integral with the bolt, see Fig.2A at 20 and 20a, said gear Zila being peripherally provided with teethrelatively pitched to operably engage the teeth of the rack I 9. Theconstruction of the rack I9 and gear 20a is such as to eliminate backlash in such members thus providing accurate adjustment tothe platemembers.

The gear 20a is provided with the extension 23 which threadably engagestheadjusting nut 2| on the under side of the lower plate. For purposesof clearance, the first thread of this nut is reamed out, while a smalllocking pin 24 secures together the extension 23 and the nut 2 I, thusthe nut 2|, when turned, aotuates the gear, which, in turn, laterallyadjusts the diameter of gauge.

The rack of the member I0 is provided With a distance from the outsideslot being provided with a scale C corresponding to the teeth of therack. Thus any setting may be noted and recorded for future reference,by observing the number on the scale adjacent the peripheral edge of thewasher 25, when the members IB and II are set. Only one scale C is shownas the relative scale on plate II will be the same, reading from zeroupwardly and from the outer edge inwardly.

For maintaining the plate members in adjustment, a suitable washerhaving a counter bore provided therein on the underside to .permitclearance to the gear 20a is dropped over the bolt and a threadablymounted clamping nut 22 turned to firmly secure the elements in posi-Ytion. The counter bore in the washer 25 is optional but is, assuggested, for clearance t-o the gear. The adjusting nut 2| may be ofslightly larger diameter than the clamping nut 2,2, both nuts beingprovided with knurled gripping sur-A faces.

The plate I is provided with the scale D, saidl ing or width between thestuds I5@ and |512` as shown in Fig. 3.

The opening between the studs I5c and ld corresponding to the openingbetween the studs I5a and Ib may be taken and recorded for futurereference. g

The plate II is provided with the; degree scale E, said scale indicatingthe magnitude of the angle at X. It is here noted that the constructionofthe gauge makes the sum of the angles X+Y= degrees, therefore, ,theYangle YY always=120-`X, and since the'point angles of taper drillsseldom exceed 120 degrees, the angles X or Y will serve to measure. suchpoint angles. The scales Dand E havebeen shown for the major diameter ofthe gauge reading I5 on the scale- C as this setting will give themaximum gauge diameter. For other settings on scale C, the scales D andE would have to be graduated accordingly. It will be found that thescales D and E graduated-for a maximum C reading on a few gauges ofvarying sizes will meet nearly al1 taper requirements.

All scales are. to be accurately machine divided and legibly marked, itbeing understood that the scales may be divided in either English ormetric systems.

The bevel on the under side of plate I I and the flat under side ofplate I0 are left free of marklikewise the distance between studs I5cand I5d is recorded. The slant length of the taper is indicated from thegraduations on edges I3 and I4 of the plates. The. studs I5a and I5c onplate I I, likewise studs ISU and I5d on plate I0, being 12 inchesapart, give the per foot relationship of taper as expressed from thedifference ofthe lateral distances betweenstuds I5c and I5d,`, minus thedistance between studs I5a and I5b.

While the preferred embodiment of the invention has been disclosed, itis understood that minor changes in the details of construction andarrangement of co-operating elements may be resorted to within the scopeof what is claimed without departing from the spirit of the invention.

A taper gauge comprising two pivotally coneach of said plate membersbeing of substantially triangular shape, and having their inneredgesdisposed 30 degrees angularly to their outer edges, the inner apexof the triangle beingformed into an arc, one of said plates beingprovided with a bevel along its under edge and a graduated ylinear scalealong the upper edge, the other plate being provided with a bevel alongitsupper edge, said bevelled edge being provided with a linear scaleidentical to the scale on the relative plate, the above said connectionbetween the plate members comprising an elongated slot in each plate,each slot being provided with a suitably pitched rack and scale alongone edge, the rack in the one plate being oppositely disposed to therack in the other plate, means for laterally actuating the plates, andmeans for maintaining the plates in adjustment.

ARCI-IIE L. BOSENCE.

GEORGE B. INGRAHAM.

